xml-dev - XML DTD help for binary data

[Gang He <gang@cs.wisc.edu>]

Hi,
I am working on writing a XML DTD to describe a data file. The file will
contain some binary data. I understand that I can use Entity and
Notation to do the job. But for some reason I have to make the file
containing the binary data a XML document file. Could someone please
tell me whether I can use PCDATA for the binary data directly or I
should make all binary characters into character references and then put
them in PCDATA? And if I need make all binary characters into character
references first, is there any way to convert the binary character into
character reference automatically? 
Many thanks in advance. 
Gang

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